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Day 288: JEE Mains Chemistry

5 questions. Try each one first, then open its answer.

  1. Question 1

    Some Basic Concepts of Chemistry. Asked once: 3 Apr 2025 (same type asked 6 times) See all 6 of this type

    112
    Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given : Molar mass of Mg is 24 g mol−124\text{ }g{\text{ }mol}^{- 1}.

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  2. Question 2

    The p-Block Elements. Asked once: 22 Jan 2025 (same type asked 6 times) See all 6 of this type

    103
    The maximum covalency of a non-metallic group 15 element ' E ' with weakest E−EE - E bond is :

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  3. Question 3

    Hydrocarbons. Asked once: 8 Apr 2023 (same type asked 6 times) See all 6 of this type

    51
    Molar mass of the hydrocarbon (X) which on ozonolysis consumes one mole of O3O_{3} per mole of (X)(X) and gives one mole each of ethanal and propanone is ___gmol −1\_\_\_ gmol\ ^{- 1} (Molar mass of C : 12 g mol−1,H:1 g mol−112\text{ }g{\text{ }mol}^{- 1},H:1\text{ }g{\text{ }mol}^{- 1} )

  4. Question 4

    Chemical Bonding and Molecular Structure. Asked once: 12 Apr 2023 (same type asked 6 times) See all 6 of this type

    45
    The bond order and magnetic property of acetylide ion are same as that of

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  5. Question 5

    Solutions. Asked once: 25 Jul 2022 (same type asked 6 times) See all 6 of this type

    33
    The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L−10.5\text{ }mL{\text{ }L}^{- 1} is 0.0405∘C0.0405^{\circ}C. Density of formic acid is 1.05 g mL−11.05\text{ }g{\text{ }mL}^{- 1}. The Van't Hoff factor of the formic acid solution is nearly: (Given for water kf=1.86 K kg mol−1k_{f}= 1.86\text{ }K\text{ }kg{\text{ }mol}^{- 1} )

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